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WVILLIAM \V. REDFIELD, OF MINNEAPOLIS, MINNESOTA.

DRAFTSIVIANS INK-MIXER.

SPECIFICATIQN forming part of Letters Patent No.313,239, dated March 3, 1885.

Application filed May 12, 1884.

time and more convenient manner than usual.

1 would here remark that the ordinary practice is to take a saucer or ink-stone or ink-slab, and after placing water therein to rub the cake of india-ink back and forth in said water until the ink is black enough and su flieient in quancity. This operation, as draftsmen well know, consumes considerable time, and withal has to be repeated from time to time. The drafts man must suspend his real work for the purpose of grinding up his ink. In my invention I propose, ifdesired, to do away,if not entirely, to a considerable extent with these evils, and to fully elucidate the same I will now describe at length my improved draftsmans ink-mix er, for the use of draftsmen and others.

In the drawings, Figure 1 represents aplan view, partly in section; Fig. 2, a side elevation; Fig. 8, a side sectional elevation, and

Fig. 4 a section on line a: 3/ in Fig. 2.

The same letters of reference are generally applicable to all the figures.

B is a block of wood forming a foundation. The top surface of same has a relieved boss turned on thesameto fitintoacorrespondinglyshaped recess in the under side of an ordinary ink-cup, K, of Wedgewood ware. A rectangular pin or key prevents said cup Kfrom re volving.

A is a casting, formed either of brass, caststeel. or cast or malleable iron; forming, es sentially, a frame-work. This frame A is secured to the foundation or base piece B by means of four screws, P P P P. A shaft, H, formed best and most economically perhaps, of cast-steel, is turned to fit nicely into a hole drilled verticallyin the frame A, as the drawings show, in the hub a on said frame A. This shaft-hole is drilled upward to within a proper distance ofthe top. The remainder of the hub (N'n model.)

a is tapped to allow a thumb-screw, D, to work therein, said thumb-screw being of a slightly smaller diameter than the shaft H.

From the drawings it will be seen that the shaft H extends only part way up into the hole in hub a. Above the shaft H is fitted into a hole in hub a a short cylinder, G. Above this short cylinder G is a spiral open spring, F, of moderate stiffness. Above this spring F is another short cylinder, E, against which the thumb-screw D bears on being screwed tical movement downward of said shaft H- through said wheel 0, and along the key of said wheel 0, that said key-seat h, Figs. 2 and 4, will engage over. To hold the bevel gearwheel 0 steadily at its proper height, an interruption occurs in the hub ain the frame A sufficient to prevent any undesired vertical movement of said bevel gearwheel O. The lower end of the shaft H is formed of a shape shown on the drawings. A slot or recess suitable to receive the end of a stick-of india-ink, I, is made at this end of the shaft H, and a thumb-screw, J, holds the cake of ink firmly in the socket in the shaft H. The lower end of the india-ink rests in the ink-cup K. Motion is communicated to shaft H by the bevelwheel 0 meshing into the bevel-wheel O on said shaft H. The crank shape ofthe lower end of said shaft makes the stick of india-ink I travel in a circular path against the bottom and inside of the cup K. Pressure of the ink against said cup K is obtained by means of the shaft being free to move downward and the action of the spring F against the top of said shaft, and when the spring may happen to lose some of its elasticity a few revolutions of the thumb-screw D again brings pressure on the .ink, and said pressure may be increased or decreased at pleasure by turning the thumb screw D one way or the other. The short cylinders E and Gare for the purpose of protect ing the spring F againstthe revolutions of the shaft H, and also to give a bearing for the pressure exerted on screwing down the thumbbetween the crank M and the end of the hub on the frame A in which said shaft L revolves.

In lieu of the crank M, a spur-gear connected with a clock-work movement may be used to give motion to the apparatus. In this way the time saved will be more of course than when driven by hand.

Another feature which is necessary for the perfect usefulness of the apparatus is a small can, m, of tin or other suitable material, attached to the frame A or the block B, and a pipe with astop cock, is, thereon, so that water may be delivered at pleasure into the cup K.

Fig. 3 of the drawings shows a small hole and pipe, n, connecting with the same and a stop-cock, 0, on the same. Thisis for the purpose of drawing off the liquid india-ink into bottles, as some draftsmen prefer to use the india-ink in that shape.

Having now fully described my invention,

I desire to claim, and secure by Letters Patent, as follows:

1. In a draftsrnans ink-mixer, the combination of the frame A, the screws 1? P, and the base-piece B, said base-piece having a relieved boss on top of same for the purpose of receiving an ink-cup, K, thereon, and all arranged substantially as and for the purposes hereinbefore set forth.

2. In a draftsmansink-mixer, the combination of the frame A with the shaft H, having its slot h and bearing the bevel gear-wheel O, the pieces E and G, the spring F, the setscrew D, the crankshaft L, bearing the bevel gear-wheel C, and the set-screw J, all substantially as and for the purposes hereinbefore set forth.

8. In adraftsmans ink-mixer, the shaft H, having its sloth and arecess at end for retaining a piece of india-ink, I, substantially as described.

In testimony whereof I do aflix my signature 

